The object cannot be attached because it is already in the object context.

I have solved this error .If the object is already attached, simply put EntityState to Unchanged. Namespaces :C#

using System.Data

C#

_context.ObjectStateManager.ChangeObjectState(requisitionEdit, EntityState.Unchanged);
_context.Attach(requisitionEdit);
_context.ObjectStateManager.ChangeObjectState(requisitionEdit, EntityState.Modified);

If have any query then feel free ask me